#21c3

Live, measured metrics for the hashtag #21c3 from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #21c3

This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.

$2,449.80/ year · 4-character #name
Claim #21c3 — $2,449.80/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
14
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 14
0
Avg reactions / post
Mastodon · last 14
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · mastodon.online (Mastodon public tags API) · fetched 2026-11-07 02:50 UTC
0
11-01
0
11-02
0
11-03
0
11-04
0
11-05
0
11-06
0
11-07

0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · mastodon.online (Mastodon public search API) · fetched 2026-11-07 02:50 UTC
#fc21fb8e3c7
3 uses · 3 accounts / 7d
#f3f21ad367c
0 uses · 0 accounts / 7d
#f9fab21c5c3
0 uses · 0 accounts / 7d
#f2c3a21a54d
0 uses · 0 accounts / 7d
#f21e3fe0a4c
0 uses · 0 accounts / 7d
#guid3a21c7938d85
0 uses · 0 accounts / 7d
#ff8006f3c21
0 uses · 0 accounts / 7d
#f8d3f21c8c2
0 uses · 0 accounts / 7d
#21C3AA
0 uses · 0 accounts / 7d
#21C5F3
0 uses · 0 accounts / 7d
#3C21E7
0 uses · 0 accounts / 7d
#dC3WTFCamp21
0 uses · 0 accounts / 7d

Live pulse

measured · mastodon.online (Mastodon tag timeline) · fetched 2026-11-07 02:50 UTC

Everything below is measured over the latest 14 public posts (spanning ~37056 hours).

Posting hours (UTC) — busiest: 13:00

00:0012:0023:00

Languages: English (8) · German (5) · Croatian (1)

Avg boosts / post: 0

Top of the latest posts

  • Vor Jahren Schlittschuhe gekauft, um beim #21c3 auf der Eisbahn auf dem Alex Pause zu machen. Heute hat sich der Absatz vom Schuh gelöst. Kriegt man sowas sinnvoll repariert, und wenn ja wie - oder ist das ein Fall für 'bitte neu'?

    MaineC@[email protected]♥ 0↻ 02026-02-15 13:36 UTCView post →

  • Zur Abwechslung der CCC Jahresrückblick vom #21c3 https://media.ccc.de/v/055_CCC-Jahresrueckblick 📺📺

    heiko linke@[email protected]♥ 0↻ 02024-09-11 10:28 UTCView post →

  • Stellt sich raus dass bei einer Reihe meiner alten Congress-Vortraege der Name fehlt und die Vorträge damit vielleicht nicht so gut gefunden werden. Update angefragt @c3voc https://media.ccc.de/v/099_GPL_fuer_Anfaenger https://media.ccc.de/

    hubertf@[email protected]♥ 0↻ 02024-06-07 13:21 UTCView post →

#21c3 across platforms

every network with a public tag surface

Follow #21c3 straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/21c3